An Etymological Dictionary of the German Language/Annotated/verdauen
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verdauen, verb, ‘to digest,’ from the equivalent Middle High German verdöuwen (verdöun), verdouwen, with the simple forms döuwen, douwen, Old High German douwen (dęwen), firdouwen, ‘to digest’; compare Dutch verduwen. The assumed Teutonic þaujan, ‘to digest,’ is probably connected with tauen (literally ‘to dissolve’). —